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CustomError.spec.js
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CustomError.spec.js
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'use strict';
const chai = require('chai');
const expect = chai.expect;
const CustomVError = require('../lib/CustomVError');
class TestError extends CustomVError {
constructor(...args) {
super(...args);
this.message = this.message || 'Test message';
}
}
describe('CustomVError', function () {
describe('constructor', function () {
it('captures stack trace', function () {
function createError() {
return new TestError();
}
expect(createError().stack).to.include('at createError');
});
it('sets the name', function () {
expect(new TestError().name).to.eq('TestError');
});
it('sets the default message', function () {
expect(new TestError().message).to.eq('Test message');
});
it('sets the custom message', function () {
expect(new TestError('Custom message').message).to.eq('Custom message');
});
// TODO: other ways to call the constructor?
// Maybe show how to wrap another error?
});
describe('set message', function () {
it('sets the custom message', function () {
const error = new TestError();
error.message = 'Custom message';
expect(error.message).to.eq('Custom message');
});
});
describe('get message', function () {
// TODO: I don't know what all this code in get message is supposed to do
});
it('matches custom error class using instanceof', function () {
try {
throw new TestError();
} catch (error) {
expect(error instanceof TestError).to.eq(true);
}
});
it('matches Node Error class using instanceof', function () {
try {
throw new TestError();
} catch (error) {
expect(error instanceof Error).to.eq(true);
}
});
it('serializes name, message and code', function () {
try {
throw new TestError();
} catch (error) {
expect(JSON.stringify(error)).to.eql('{"name":"TestError","message":"Test message"}');
error.code = 123;
expect(JSON.stringify(error)).to.eql('{"name":"TestError","message":"Test message","code":123}');
}
});
});